Grab your new issue of Seventeenand head to the Glendale Americana this Monday, July 8th for the chance to meet Ariana Grande! The signing starts at 7 p.m., and you'll want to get there early to beat the crowd. Ariana's excited to pose for pics and sign your copies of Seventeen!

If you can't make the signing, you can still win an Instagram shout-out ftom Ariana by entering Seventeen's Instagram challenge. Click here to get the deets!